Northern Territory authorities will start an inquiry into Azaria Chamberlain's official cause of death, after her mother used the 30th anniversary of her disappearance to call for justice.

Azaria disappeared near Uluru on August 17, 1980.

Lindy Chamberlain-Creighton, who claimed a dingo had killed her baby, was found guilty of murder in 1982 but the conviction was quashed after she served three years in prison.

Ms Chamberlain-Creighton yesterday published an open letter calling for the official cause of death to be changed to recognise that her daughter was killed in a dingo attack.

Azaria's death certificate currently lists the cause of death as unknown.

Northern Territory Attorney-General Delia Lawrie has asked the Registrar of Births, Deaths and Marriages to start an inquiry to determine if the registered cause of death is accurate.

In a statement, Ms Lawrie says the investigation will take into account the most reliable information currently available.

A 1995 inquest into the baby's death returned an open finding.

"I have also written to Mrs Chamberlain-Creighton, informing her of the inquiry into the registered cause of death on Azaria Chamberlain's death certificate," Ms Lawrie said.

Meanwhile, a Melbourne couple have spoken about their experience at Uluru the night Azaria disappereared.

Max and Amy Whittaker were at the same camping ground as the Chamberlains, and helped search for the missing baby.

They' have told of being convinced that a dingo took Azaria, and Mr Whittaker says he is still puzzled at some of the events later.

"I cannot understand why the police never questioned any of the four camping families in the couple of days that they were there," he said.

"Instead they took six to eight weeks to catch up with us.

"By that time they had firstly decided that she'd been killed in the afternoon at Ayers Rock and then when that was disproved they then decded she had definitely killed her."

Outgoing Northern Territory Chief Justice Brian Martin has also weighed into the Azaria debate, saying jury notes from Ms Chamberlain-Creighton's trial, which were recently published by News Limited, should have been destroyed.